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Opposing parties in state legislatures sometimes deadlocked on electing a senator, leaving Senate seats vacant for months or years. In a 1911 cartoon, Uncle Sam bemoaned the “usual crop” of deadlocks while observing four state legislatures at odds over candidates. The following year Congress approved a resolution by Senator Joseph Bristow of Kansas that became the Seventeenth Amendment, requiring direct election of U.S. senators.
Records of the U.S. Senate, National Archives and Records Administration